Admissable Evidence & The Chain of Evidence
When considering different types of evidence, the U.S. Courts do not make any distinction between testimonies, documentaries, or ‘tangibles’ (i.e, objects, pictures, items or things). It can all be categorized as ‘admissable’.
Yet in both the United States and Australia, attorneys cannot present evidence that was secured by violating a constitutional law. Admissable evidence that is later found to have been obtained by violating a constitutional law can be excluded.
Investigators know this and often refer to sections of their work as the ‘chain of evidence’. The chain of evidence is usually a written report that ensures investigators and lawyers know when and where material or possibly significant evidence was found and where it is being maintained- until it is needed for trial or mediation. As an example, the location, date, and document type are all part of the chain of evidence.
Any new evidence that is obtained will never alter the original chain of evidence - unless a law was violated in order to gain the evidence.